JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 495 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What number does this code print?
   let a = 32;
   let b = 10;
   console.log(a + b);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
3. 3.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) if (d) console.log()
4. 4.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) alert()
5. 5.⚡ What number does this code print?
   let a = 41;
   let b = 28;
   console.log(a + b);
6. 6.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
7. 7.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) name (d) Arjun
8. 8.⚡ What number does this code print?
   let a = 58;
   let b = 26;
   console.log(a - b);
9. 9.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) console.log()
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
11. 11.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
12. 12.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
13. 13.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
14. 14.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
15. 15.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
16. 16.⚡ What number does this code print?
    let score = 24;
    score = score + 12;
    score = score - 10;
    console.log(score);
17. 17.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 6;
    marks = marks - 9;
    console.log(marks);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 14 (b) Error (c) 5
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) console.log()
20. 20.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 2;
    coins = coins - 8;
    console.log(coins);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 52 (c) 7
23. 23.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
24. 24.⚡ What number does this code print?
    let a = 25;
    let b = 26;
    console.log(a + b);
25. 25.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
30. 30.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
33. 33.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
37. 37.⚡ What number does this code print?
    let a = 41;
    let b = 14;
    console.log(a - b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
39. 39.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 9;
    runs = runs - 17;
    console.log(runs);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids